Case-study Bach; Nannerl Mozart

The case-study on Bach mentioned in the previous framework should be more related to the actual performance practice. Actually, this is not difficult as I have clear example of a concert with Bach and new improvisations/compositions with flutist Martijn Alsters in Zaltbommel this summer. I just did not think of that before. Here is the program:

We are preparing more concerts in this way.

Yesterday I watched Robert Levin's lecture-recital Improvising Mozart at Cambridge University. I did not know that Mozart wrote pseudo-improvisations for his sister. Nannerl could not improvise, but evidently was expected to do so during recitals, as that was the habit. So her brother helped her a little to make the audience believe she was improvising. Wolfgang improvised all the time while performing; "I just play what comes to my mind".